DIN EN ISO 28721-3-2011 釉瓷和搪瓷.加工厂用玻璃衬里器具.第3部分:抗 热震性(ISO 28721-3-2008);德文版本EN ISO 28721-3-2011
Vitreous and porcelain enamels - Glass-lined apparatus for process plants - Part 3: Thermal shock resistance (ISO 28721-3:2008); German version EN ISO 28721-3:2011
This part of ISO 28721 specifies requirements for applies to quality requirements on thermal shock resistance as well as heating and cooling procedures of standardised glass-lined apparatus, components, accessories, and glass-lined pipes primarily used for process equipment in chemical plants.
It specifies the limits of thermal shock resistance using diagrams (see Figure 1 and Figure 2). For glass-lined steel, a distinction is made between a thermal shock on the glass-lined side (produced by charging an apparatus) and a thermal shock on the steel side (produced by heating or cooking an apparatus)
The part of ISO 28721 applies to operating temperatures from -25 °C to +230 °C
It is only applicable to enamelled unalloyed and low-alloy carbon steels.